Motor control apparatus



NOV. 24, R M GKLSON MOTOR CONTROL APPARATUS Filed Dec. 5. 1929 Patented Nov. 24, 1931 i UNITED STATES PATENT OFFICE ROBERT M. GILSON, OF PITTSBURGH, PENNSYLVANIA, ASSIG-NOR T THE UNION SWITCH 6a SIGNAL COMPANY, OF SWISSVALE, PENNSYLVANIA, A CORPORATION 0F PENNSYLVANIA MOTOR CONTROL APPARATUS Application led December 3, 1929. Serial No. 411,283.

My invention relates to motor control apparatus, and particularly to apparatus for controlling the operating motor for a railway switch from a remote point.

@ne feature of my invention is the provision of means for interrupting the motor circuit if the current supplied to the motor becomes excessive, and for subsequently preventing` the motor circuit from being restored until the device which controls the motor controller is operated.

I will describe one form of apparatus embodying` my invention, and will then point out the novel features thereof in claims.

The accompanying drawing is a diagrammatic view showing one form of motor control apparatus embodying my invention applied to the control of an electric motor for operating a railway switch.

Referring' to the drawing, the reference character S designates a railway switch which is operated by a motor M through the medium of a suitable switch-operating,r mechanism A. This mechanism forms no part of my presentinvention, and its structure is therefore not shown in the drawing. This mechanism, however, comprises a rotatable shaft 65 adapted to receive a crank 66 by means of which the switch at times may be manually operated.

Associated with the shaft 65 is a circuit controller F comprising a normally closed Contact 11-11a which is opened when the crank 66 is placed on the shaft 65, and a normally open contact 12,-12"l which is closed when the crank G6 is placed on the shaft 65.

'The switch S operates a circuit controller E comprising a contact 1 0-10a which is closed at all times except when the switch occupies its extreme reverse position, and a contact 9 9Etv which is closed at all times except when the switch occupies its extreme normal position, in which latter position it is illustrated in the drawing'.

The motor M is controlled by a motor controller, designated in general bythe reference character D, which motor controller, in turn, is controlled by the circuit controllers E and F., and by a polarized relay E. The polarized relay R will usually be controlled from a point remote from the motor controller D, such for example,'as a train despatchers oflice, and may be controlled in any suitable manner as by pole-changing contacts on a manually operable switch lever.

The motor controller D, in the form here shown, comprises a normal contactor Cn and a reverse contactor C. These contactors are exactly alike and each comprises an armature 3, pivoted at 4, and controlled by a winding 5. Each armature 3 is operatively connected with three contacts 6, 7 and 8. When winding 5 of either contactor Cr or C is deenergized, armature 3 of this contacter occupies the position in which it is illustrated in the drawing, and the associated contacts 6, 7 and 8 are open. When the winding 5 of the contactor is energized, however, armature 3 of this contacter is swung to a position in which the associated contacts 6, 7 and 8 become closed.

The armatures 3 of the contactors C and Cr are controlled by an interlocking rod 13 in such manner that the armature 3 of one contacter cannot be moved to the position in which its associated contacts are closed une less the armature 3 of the other contactor occupies the position in which its associated contacts are open. The interlocking rod 13 is mounted to slide in suitable holes formed in two fixed abutments 14, and is arranged to operate a circuit controller G. The circuit controller Gr, in the form here shown, comprises a Contact 2.5-25a which becomes closed when armature 3 of contactor Cn is moved to the position where its associated contacts become closed, and which subsequently remains closed until just after armature 3 of contactor C has been moved to the position where its associated contacts become closed. The circuit controller G also comprises a contact Ll--if which becomes closed when armature 3 of contactor C is moved to the position where its associated contacts become closed. and which subsequently remains closed until liust after armature 3 of contactor C has been moved to the position where its associated contacts become closed.

The motor controller D also comprises two thermal relays Tn and Tf, each comprising a thermo-sensitive device and a heating element 18 for heating the device. As here shown, each thermo-sensitive device is a bimetallic strip 17 arranged in such manner that the free end of the strip will deflect upwardly when the associated heating element 18 is supplied with current, theinagnitutle of which exceeds the normal operating` current for motor M. Each bimetallic strip 17 operates a contact 17--172L which is normially closed, but which becomes opened when the associated bimetallic strip 17 is deflected.

As shown in the drawing', switch S occupies its normal position, so that contact 9--9a of circuit controller E is open, and contact 10-10"L of circuit lcontroller E is closed.

Crank 66 is removed from the shaft 65., and

v.de-energized, and the contacts 6, 7 and 8 of these contactors are all open but contact 25-25a of circuit controller G is closed. Thermal relays T and Tr are both de-ener- 'gizech and contact 17--17a of each of these Ycontactors is therefore closed. Polarized relay R is 'energized in its normal direction lso that its front contact 21 and its normal con- "ta'cts 234-23a and 61-61a are closed. I will now assume that with the parts in the positions JustV described the train despatcher wishes to reverse switch S. To do this, he

vreverses relay R so that relay R opens its normal contacts 23-23l and til-61a, and closes its reverse contacts 233-23b and (S1-61". Current is then supplied, to the winding 5 of contactor Cr from the terminals B and'X of a suitable source of current not shown in the drawing over a pick-up circuit which passes from terminal B, through wire 20, front AContact 21 of relay B, wire 22, reverse Contact 23-23b of relay R, wire 24, contact 25 25? of vcircuit controller'G, wires 26 and 27 ,winding 5 of contactor Cr, wire 28, contact 17-17EL `of thermal relay Tr, and wire 29 'to terminal X. As a result, winding 5 of Acontactor Cf becomes energized, so that ar- Y mature 3 of this contactor is moved to the position in which its associated contacts 6, 7 and l6 become closed. xWhen armature 3is moved to this position, vContact 25-25a ofi-circuit controller Gis' opened, thus imzerruptinp,` the pick-up circuit just traced for winding 5 of contactor Cf, but since cont-act 6 of circuit controller `Cr is then closed, winding` A5 is Vmaintained in its energized condition byl virtue of a stick circuit which passes from terminal B, through wire 20, front Contact 21 of relay R, wire 22, reverse contact 23--23b of relay R, wires 24 and 40, Contact 10-10L1 ofcircuit lcontroller E, wire 41, contact 6 of circuit controller Cr, wires 42, 43 and 27., winding 5l of contactor Cr, wire 28, contact 17--17zL of thermal relay T, and wire 29 to terminal X. Vhen contacts 7 and 8 of contactor Cr become closed, a circuit for motor M is completed, and current flows from terminal B, through wire 30, contact 8 of circuit controller Cf,.wires 31 and 32, armature 1 of motor M, wires 33 and 34, contact7 of contactor Cr, wire 35, heating element 18 of thermal relay Tf, wires 36 and 37, field winding 2 of motor M, wire 38, contact 11--11'CL of circuit controller F, and wire 39 to terminal X. Motor VM therefore operates to move switch S from its normal to its reverse position. When the switch reaches its full reverse position, contact 10-10a of circuit controller E opens, thereby interrupting the stick circuit previously traced for winding` 5 of contactor C1', so that contactor Cr becomes deenergized and opens its contacts 6, 7 and 8. lVhen contacts 7 and 8 of contactor Cr are opened, the circuit just traced for, motor M is interrupted and the motor stops. VvAll parts are then cle-energized.

If, after the switch has reached its fullreverse position, the train despatcher wishes to restore the switch to its normal position, he restores relay B to its normal position in which it is illustrated in the drawing. Since contact l6-46a of circuit controller Gr is now closed, a pick-up circuit for winding 5 of contactor C is completed from terminal B,

ythrough wire 20, front contact 21 of relay R,

wire22, normal contact 23-23a of relay B, wires 44 and 45, contact 46-46a of circuit controller G, wires 47 and 48, winding 5 of contactor Cn, wire 49, contact 17-17aN of relay T, and wire 50 to the other terminal X. Winding 5 of contactor C therefore becomes lenergized so that armature 3 of this contactor is moved to the position in Ywhich vits associated'contacts 6, 7.and 8 are closed. When armature 3 is movedV to this position, contact 46-46a of circuit controller G opens and interrupts the pick-up circuit just traced for winding 5 of contactor C, but contact 6 of circuit controller C is then closed, and since contact 9---9a of circuit controller E is closed,

winding 5 is maintained in its energized condition by Vvirtue of a stick circuit which passes from terminal B of the source, through wire 20,. front contact k21 of relay B, wire22, normalcontact 23,-23a of relay B, wires 44 'and 51, contact 9-9a'of circuit controller E, wire 52, lcontact 6 of contactorl Cn, wires 53 and 48, winding 5 of contactor C, wire 49, contact 17 -171 of thermal relay T, and wire 50 to terminal X` When contacts 7 Vand 8 of contactor C becomes closed a circuit for motor M is completed which passes from terminal B, through wire 54, contact 7 of circuit controller Cn, wires 55 and 33, armature 1 of motor M, wires 32 and 56, contact 8 of contactor C, wire 57, heating element 18 of thermal relay Tn, wires 58 and 37, field winding 2 of motor M, wire 38, contactll-ll2L of circuit controller F, and wire 39v to terminal X. Motor M then restores switch A to its normal position. When the switch reaches its full no-rmal position, contact 9-9a of circuit controller E opens and de-energizes contactor Cn. TWhen contactor C becomes deenergized, the contactor lopens its contacts and interrupts the circuit just traced for motor M, so that the motor stops, and the parts are then restored to the position in which they are illustrated in the drawing.

If, for any reason the motor current rises above the normal value while switch S is being moved from one eXtreme position to the other extreme position, the motor will be deenergized automatically, so that damage to the motor will be prevented. For example, I will assume that the motor current rises above the normal value when switch S is being` moved from its normal to its reverse position due, for example, to the movement of the switch being arrested by some obstruction before the switch reaches its full reverse position. As pointed out hereinbefore, when switch S is being moved from its normal to its reverse position, motor M is energized over a circuit which includes contacts 7 and 8 of contactor CF and heating element 18 of thermal relay Tf. It will be apparent, therefore, that when the motor current rises above the normal value under the above conditions, biinetallic strip 17 of thermal relay TF becomes heated, and the end of the strip 17 deiiects upwardly, thereby opening contact 17-17a of this relay, and thus interrupting the stick circuit for contactor CY. Contacter C1' therefore becomes cle-energized and thus de-energizes motor M.

After motor M has been cle-energized in this manner, motor M can not again be energized in the direction to move switch S towards its reverse position until thermal relay T" has cooled sufiiciently to close its contact 17-17a and Contact 2525a of circuit controller G has been closed, because, when either of these contacts are open, the pick-up circuit for windinfr 5 of contactor Cr is interrupted. In order to close contact 25-25 of circuit controller G it is necessary to energize contactor Cu, which can only be done by reversing relay R to close its normal contact In similar manner, if the motor current rises above its normal value when switch S is being moved from its reverse to its normal position, strip 17 of thermal relay Tn deflects upwardly, and de-energizes contacter C, thereby de-energizing motor M. Motor M can not then again be energized in the direc tion to move switch S towards its normal position until strip 17 of thermal rela-y Tn cools and closes its contact 17-17, and until relay Y R is reversed to energize contactor C?, and

mal relay T or contact i6-4:6a of circuit controller G is open, the pick-up circuit for the normal contactor C is interrupted so that contactor C can not be energized.

i I It should be pointed out that if crank 66 is placed on shaft in order to operate switch S manually, both circuits for motor M are then opened at contact 11--11a of circuit controller F, and motor M can not, therefore, be energized under these conditions.

It should also be pointed out that if switch S is operated manually by means of crank 66 from the eXtreme position corresponding to the position which relay R occupies to an intermediate position, or to its other extreme position, then, as soon as crank 66 is removed from the shaft 65, the switch will be restored automatically to its proper position. For eX- ample, I will assume that switch S is operated manually from its normal position by means of crank 66 to either an intermediate position, or to its reverse position when relay R occupies its normal position. Under these conditions, as long as crank 66 is on shaft 65 both circuits for motor M are open at contact 11-11ZL of circuit controller F, and an auX- iliary pick-up circuit for winding 5 of con tactor Cn is closed at Contact 12--12L of circuit controller F, this auxiliary pick-up circuit passingl from terminal B through contact 12-12a of circuit controller F, wire 60, normal contact 61--61a of relay R, wires 63, 58 and 48, winding 5 of contactor Cn, wire 49, contact 17-17a of thermal relay T and wire 50 to terminal X. Contacter C therefore becomes energized and closes its contacts 6, 7 and 8. If crank 66 is then removed from shaft 65, the opening of contact 12-122L of circuit controller F will interrupt the auX- iliary pick-up circuit just traced for winding 5 of contactor C, but since contact 6 of this contactor is now closed, the stick circuit previously traced for winding 5 is closed, and contactor C will therefore remain energized. As a result, when contact 11-11a of circuit controller F closes, motor M becomes energized and restores switch S to its normal position. ,lVhen switch S reaches its normal position, contact 9 9 of circuit controller E opens, thereby cle-energizing contactor C and thus de-energizing motor M. The parts are then restored to the positions in which they are illustrated in the drawing.

' In similar manner, if switch S is operated manually from its reverse position to its nor* mal position by :'neans of crank 66 when re lay R occupies itsl reverse position, then when crank V66 is removed from the shaft 65, the switch will be automatically restored to its reverse position. For, under these conditions` as long as crank 66 is on shaft 65, both circuits for motor M are interrupted at contact 11-11 of circuit controller F, and an al'lxiliary pick-up circuit for winding 5 of contactor C" is closed from terminal B, through wire 59, contact 12--12=L of circuit controller F, wire 60, reverse contact (5l-61" lof polarized relay R, wires 62, 43 and 27,

winding 5 of vcontacter Cr, wire 28, contact 17-17 a of thermal relay Tf, and wire 29 to yterminal X. Contactor Cr therefore picks IO--lOfL of circuit controller E, and contactor`V Cf therefore becomes de-energized and deenergizes motor M. All parts are then deenergized. n

' While I have illustrated motor vcontrol apparatus embodying .my invention as applied te the control of a motor for operating a railway switch, it will be readily understood that apparatus embodying my invention issnot limited to this use, ybut may be applied to the control of any reversiblemotor for operating any movable device.

Although'I have herein shown andY described .only one form of motor control apparatus embodying my invention, it is understood that various changes and modifications may be made therein within the scope of the appended claims without departing from the spirit and scope of my invention.

Having thus described my invention, what I claim is:

1. Incombination, a movable device, an electric motor for operating said device, a first circuit controller operated by said'device, two contactors, a second circuit controller operated by both said contactors, means including said circuit controllers for selectively energizing said contactors, and means controlled by said contactors for energizing said motor. v

i 2; In combination, a railway traiiic governing device having two positions, a manually controlled device capable of assuming different conditions, means for operating said railway ltraiiic governing device to-one position .or the lother in accordance with the condition of said manually controlled device', other means for at times manually operating said railway traflic governing device,

and means eii'ective after said railway traffic governing devicer has been manually operated for automatically restoring said rail'- way traiiic governing device to the position corresponding to the condition of said manually controlled device.

3. In combination, a railway switch having normal and reverse positions, a manually controlled polarized relay, means i'oroperating'said switch to its normal or reverse po- Vsition according as said polarized relay is been manually operated for automatically restoring said switch to the position corresponding to the conditionV of said polarized relay.

4. In combination, a railway switch having Vnormal and reverse positions, a manually controlled polarized relay, means for operating said switch to its normal or its reverse position according as said polarized relay is energized in one direction or the other, means for at times manuallyoperating said switch, a contact which isoperated when said switch is manually operated, and means controlled in part by said contact for automatically restoring said switch to the position corresponding to the condition of said polarized relay after said switch has been manually operated.

5. In combination, a railway switch, a manually controlled relay capable of assuming different conditions, a normally closed contact, a normally open contact, means including said `normally closed contact for operating said switch to its normal or its reverse position in accordance with theJ condition of said relay, mea-ns for at times manually'operating said switch, means for opening said normally closed Contact and for closing said normally open contact when said switch is manually operated, and means controlled by said normally open Contact for automatically restoring said switch to the position corresponding to the condition of said relay after said switch has been manually operated.

6. In combination, a'inovable device, mechanism including an electric motor for operating said device, a first and a second winding, means effective when said iirst winding Vis energized for supplying said motor. with current to operate said motor in one direction, a iirst contact controlled by both said windings in such manner that said first contact becomes closed when said second winding is energized and subsequently remains closed until just after said first winding is energized, a normally closed contact arranged Yto be opened if the current supplied to said motor when said iirst winding is energized exceeds a predetermined value, means including said normally closed contact and said.

first contact for at times energizing said first winding, means for subsequently maintaining said first winding in its energized condition, and means for at other times energizing said second winding.V

7. In combination, a movable device', mechanism including an electric motorfer operating said device, a first and a second winding, means effective when said firstwinding is energized for supplying said motor withV current to operate said motor in one direction, a first contact controlled by said first winding and arranged to become closed when said first winding is energized, a second contact controlled by both said windings in 'due to energization of said first Winding, a

normally closed contact arranged to be opened if the current supplied to said motor When said first Winding is energized exceeds a predetermined value, means including said normally closed contact and said second contact for at times energizing said rst Winding, means includingr said lirst contact for subsequently maintaining said first Winding in its energized condition, and means or at other timesy energizing said second Winding.

8. In combination, a movable device, mechanism including an electric motor for operating said device, a first and a second Winding, means ellective When said first Winding is energized for supplying said motor with current to operate said motor in one direction, a first contact controlled by said first Winding and arranged to become closed when said first Winding is energized, a second contact controlled lby both said windings in such manner that said second contact becomes closed When said second Winding is energized and subsequently remains closed until after said first contact 'becomes closed due to energization of said v ranged to be opened if the current supplied to said motor When said first Winding is energized exceeds a predeterminedl value,

manually controlled means including said normally closed contact and said second con* tact for at timesenergizing said first Wind ing, manually controlled vmeans including said first contactV for subsequently maintaining said Vfirst Winding in its energized condition, and manually controlled means for at'other times energizing said second Winding.

9. In combination, a device'capable of assuming a first ora second position, mechanism vincluding an electric motor for 'operating said device, a first and a second Winding, means effective when said first Winding is energized for supplying said motor With current to move said device from said first position to said second position, a first contact controlled by said first Winding and arranged to become closed When said first Winding is energized, a second contact controlled lby both said windings in such manner that said second contact becomes closed When said second Winding is energized and remains closed until just after said first contact becomes closed due to energization of said first Winding, a third contact con` trolled by said device and arrangedto be closed at all times except when said device occupies its second position, a Vnormally closed Contact arranged to be opened if the current supplied to said motor exceeds a predetermined value when said first Winding is energized, means including said second contact and said normally closed contact for at times energizing said first Winding, means including said iirst contact, said normally closed contact, and said third contact for subsequently n'iaintaining said first Winding in its energized condition, and manually controlled means for at times energizing said second Winding.

l0. 1n combination, a device capable of assuming a first or a second position, mecha nism including an electric motor for operating said device, said mechanism being pro vided with a rotatable shaft adapted to receive a crank for at times manually operating said device, a lirst and a second vvinding, means effective When said first Winding is energized for supplying said motor With currentto move said device from said first position to said second position, a first contact controlled by both said windings in such manner that said first contact becomes closed When said second Winding is energized and subsequently remains closed until just after said first Winding is energized, a normally closed contact arranged to be opened if the current supplied to said motor when said first winding is energized exceeds a predetermined value, means including said norn mally closed contact and said first contact for at times energizing said first Winding, a normally open contact which becomes closed when said crank is placed on said shaft, means including said normally open contact for other times energizing said first Winding, means for subsequently maintaining said first Winding in its energized condition, and means for at times energizing said second Winding.

11,111 combination, a device capable of assuming a first or a second position, mech-V anism including an electric motor for operating said device, said mechanisin being provided ivith a rotatable shaft adapted to receive a crank for at times manually operating said device, a first and a second Winding, a circuit controller comprising a normally open contact which becomes closed When said crank is placed on said shaft and a first normally closed contact which becomes opened When said crank is placed on said shaft, means controlled by said first Winding andy including said first normally closed Contact for energizing said motor to move said device from saidviirst position to said second position, a third contact controlled by said first Winding and arranged to become closed W-lien said first Winding is energized, a fourth contact controlled by both said Windings in such manner that said fourth contact becomes closed when said second Winding becomes energized and remains closed until after said third contact becomes closed duev to energization of said first Winding, a fifth Y contact controlled by said. device andarranged to be closedat all timesexcept when T-first winding, means including said normally open contact and second normally closed contact for at other times energizing said first winding; means including said third contact, said second normally closed Contact and said fifth contact for maintaining said first winding in its energized condition after said first f winding becomes energized; and manually.

controlled` means for at times energizing said secondY winding.

2W V'12. In combination, a device capable of assuming a first or a secondposition, mechanism including an electric motor for operating said device, a first and a-second winding means eHective when said first winding is energized for supplying said motordwith current to move said device from said first position to said second position, means edective when said second Winding is energized for supplying said motor with current to 3Qffmove said device from said second position to said first position, a first contact controlled by said first winding and arranged to become closed when said first winding is energized, a second contact controlled by said second winding and arranged to become f closed when said second winding is energized, a third contact controlled by both said windings in such manner that said third contact Vbecomes closed when said second winding is @energized and subsequently remains closedy until just after said first Contact becomes closed'fdue to energization of said rst wind-H ing, a fourth contact controlled by'both'said windings in'such manner that said fourth 4-5-`contact becomes closed when saidfirst winding is energized and subsequently remains closed until just after said second contact becomes closed due to energization of said lsecond winding, a fifth contact controlled 5O-by said device and arranged to be closed at all timesex'cept when said device occupies its second position, a sixth Contact controlled by said device and arranged to be closed at lall times except when said device occupies 551its first position, a first normally closed contact'arranged to be opened if the current supplied to said motor exceeds a predetermined value when said first winding is energized, a

Asecondnormally closed contact arranged to befopenedif the current supplied toY said motor exceeds a predetermined value when said. second rwinding is energized, means including said` third contact and said rst normally closed contact for energizing said first wind- 5' ing; meaIlS including said first normally*` tact,fsaid second contact, and'said sixth contact for subsequently maintaining said second winding in its energized condition.

13. In combination, a railway switch having normal and reverse positions, operating mechanism including an electric motor for operating'saidswitch, said operating mechanism being provided with alrotatable shaft adapted to receive a crank for at times manually operating said switch, a first circuit controller associated with said mechanism and comprising a firstcontact which is normally closed but which becomes openedwhen said crank is placed on said shaft .and a second contact which is normally open but which becomes closed whensaid crank is placed on said shaft, a first contactor comprising a'first winding, a first pivoted armature controlled by' said winding, and contacts controlled by said first armature; a second contactor comprisinga second winding, ay second pivoted armature, and contacts controlled by said second armature; a first thermal relay comprising a bimetallic strip which defiects when heated, a first heating `element for Vheating said first strip, anda first normally closed contactwhich becomes opened whenV said first strip is deflected; a second thermal `relay comprising a second biinetallic strip which deflects when heated, a second heating element for heating said second strip, and a second normally closed contact which becomes opened when said second 4stripy is de-l flected a polarized relay having normal and reverse contacts; a second circuit controller controlled bysaid first and second armatures and comprising a third contact which becomes closed when said first armature Vis moved to the position where its associated contacts are closed and which subsequently remain closed until just after said second armatureis moved to the position where its associated contacts are closed, and a fourth contact which becomesfclosed when said second armature is movedto the` position where its associatedV contacts are closed and which subsequently remains closed until just after said rst armature is moved to the position where its associated contacts are closed; a third circuit controller operated by said switch and comprising a fifth contact which is closed at all times except when said switch occupies its extreme reverse position, and a sixth contact which is closed at all times except when said switch occupies its extreme normal position; a pick-up circuit for said first winding including a reverse contact of said polarizedrelay,said fourth contact, and Y said rst normally closed contact of said lirst thermal relay, a stick circuit for said tirst winding including said reverse contact et said polarized relay, a contact of said first contacter, said fifth contact, and said first normally closed Contact of said lirst thermal relay, an auxiliary pick-up circuit for said lirst winding including a reverse contact of said polarized relay, said second contact of said lirst circuit controller, and said lirst normally closed contact of said first thermal relay; a pick-up circuit for said second winding including a normal contact orn said polarized relay, said third contact, and said normally closed contact of said second thermal relay; a stiel: circuit for said second winding including said normal contact of said polarized relay, a contact of said second contacter, said sixth contact, and said second normally closed` contact of said second thermal relay; an auxiliary pick-up circuit for said second winding including said contact, a normal contact of said polarized relay, and said normally closed contact of said second thermal relay; a lirst circuit for said motor including contacts or" said first contacter, said lirst heating element, and said iirst contact; and a second circuit for said motor including contacts ot' said second contacter, said second heating element, and said lirst contact.

le.. ln combination, a device capable ot assuming a lirst or a second position, mechanism including an electric motor tor operating said device, said mechanism being provided with a rotatable shaft adapted to receive a crank or at times manually operating said device, a lirst and a second winding, a lirst normally closed contact which becomes opened when said crank is placed on said shaft, means controlled by said lirst winding and including said first normally closed contact for energizing said motor to move said device from said first position to said second position, a second contact controlled by both said windings in such manner that said second Contact becomes closed when said second winding is energized and subsequently remains closed until just alter said lirst winding is energized, a second normally closed contact arranged to be opened it the current supplied to said motor when said lirst winding is energized exceeds a predetermined value, means including said second normally closed contact and said second contact for at times energizing said lirst winding, means for subsequently maintaining said lirst winding in its energized condition, and means for at other times energizing said second Winding.

l5. ln combination, a railway traliic governing device having two positions, a manually controlled device capable of assuming different conditions, operating means for moving said railway trafic governing device to one position or the other in accordance with the condition of said manually controlled device, other means tor at times manually operating said railway traliic governing device, means for rendering said operating means ineli'ective during manual operation, and other means eli'ective after said railway trai'iic governing device has been manually operated for automatically restoring said railway traine governing device to the position corresponding to the condition ol said manually controlled device.

1G. In combination, a railway trale governing device having two positions, a manually controlled device capable of assuming diii'erent conditions, means for operating said railway trailic governing device to one position or the other in accordance with the condition ot said manually controlled device, other means lior at times manually operating said railway trailic governing device, a contact which is operated when said traiic governing device is manually operated, and means controlled in part ol: said contact ellfective after said railway traiiic governing device has been manually operated for automatically restoring said railway trallic governing device to the position corresponding to the condition of said manually controlled device.

17. In combination, an electric motor, a lirst and a second winding, means effective when said lirst winding is energized for supplying said motor with current to operate said motor in one direction, a contact controlled by both said windings in such manner that said contact becomes closed when said second winding is energized and subsequently remains closed until just after said first winding is energized, means including said contact for at times energizing said lirst winding, means for subsequently maintaining said first winding in its energized condition, and means tor at other times energizing said second winding.

18. In combination, an electric motor, a lirst and a second winding, means el'lective when said first winding is energized for supplying said motor with current to operate said motor in one direction, means eliective when said second winding is energized for supplying said motor with current to operate said motor in the other direction, a lirst contact controlled by both said windings in such manner vthat said contact becomes closed when said second winding is energized and subsequently remains closed until just alter said lirst winding is energized, a second contact controlled by both said windings in such manner that said contact becomes closed when said first winding is energized and subsequently remains closed until just alter said second winding is energized, means including said first contact for energizing said lirst windinof means for subsequently maintainu n l s n c n u ing said first winding in its energized condi- Y when said first winding is energized, a second tion.means including said second contact for at other times energizing said second winding, and ineans'for subsequently maintaining saidsecond winding in its energized condition.

19. In combination, an electric motor, a first and a second winding, an operating circuit for said motor controlled by said first winding, va contact controlled by both said windings in suoli manner that said contact becomes closed when said second winding is energized and subsequently remains closed until just after said first winding` is ener- Agized, means responsive to the magnitude of the current supplied to said motor when said first winding is energized for modifying the controll of said operating circuit by saidfirst winding, means including said contact for.

energizing said first winding, means for subsequently maintaining said first winding in its energized condition and means for at y other times energizing said second winding.

20. ln combination, a device capable of assuming a first or a second position, mechanism yincluding' an electric motor for operating said device from said first to said second position,

means for'at times manuallyv operating said device, a first and a second winding, an operating circuit for said motor controlled by said first winding, a first contact controlled b-y both said windings in such manner that said first Contact becomes closed when said second winding' is energized' and subsequently remains closed until just after said first wind- -ing is energized, means responsive to the magnitude of the current supplied to said motor whenfsaid first winding is energized for modifying the control of said operating circuit by said first winding, means including said first contact for at times energizing said first winding, a second contact operated when said device is manually operated, means including said second contact for at other times energizing said first winding, means for'subsequently maintaining said first winding in its energized condition, and means for at times energizingsaid second winding.

21. In combination, a device capable ofV contact controlled? by said second winding and' arrangedV to become closed when said second winding is energized, a third contact controlled by both said windings in such manner that said Athird contact becomes closed WheiiV said second winding is energizedand subsequently remains closed until just after saidV first contact becomes closed due toenergization of said first winding',y a fourth contact controlled by both said windings in such manner that saidY fourth contact becomes closed when said first winding is energized and subsequently remains closed until just after said second contact becomes closed due to the energizatio-n of said second winding, a fifth contact Vcontrolled by said device and arranged to be closed at all times eXcept when said deico occupies its second position, a siXtlicoiitact controlled by said device and arranged to be closed at all times except when said device occupies its first position, means responsive to the magnitude of the current supplied to said motor when said first winding is energized yfor modifying the control of said normal operating circuitby saidfirst winding, means responsive to the magnitude.' of the current supplied to saidmotor when said second winding is energized for modifying the control of said reverse operating circuit by said second winding, means including said 'third cont-act forenergizing said first winding, means including-'said first Contact ,mdv said fifth contact for subsequently mam/gaming said first winding in its energized condi tion, means including said fourth contact for energizing said second winding, and means including said second contact and said sixth contact for subsequently Amaintaining said seco-nd winding in its energized condition.

- In testimony whereof l afiiX vmy signature.

' ROBERT M. G'ILSON.

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ist

DISCLAIMER 1,833,521.R0bert M. Glson, Pittsburgh, Pa. MOTOR CONTROL APPARATUS. Patent dated November 24, 1931. Disclaimer filed June 22, 1933, by the assignee, The Um'on Switch c@ Signal Company.

Hereby enters the following disclaimer, to Wit: Your petitioner hereby disclaims the subject matter of claims 2, 3, 4, 5, 15, and 16.

[Oficial Gazette July 18, 1.933.] 

